write an equation of the line that goes through(5,-1) and is parallel to 2X minus Y equals seven

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?